It was also discovered that many superconductors, including the cuprates and iron pnictides, have two or more competing mechanisms fighting for dominance (Charge density wave)[citation needed] and excitonic states so, as with organic light emitting diodes and other quantum systems, adding the right spin catalyst may by itself increase Tc. A possible candidate would be iridium or gold placed in some of the adjacent molecules or as a thin surface layer so the correct mechanism then propagates throughout the entire lattice similar to a phase transition. As yet, this is speculative; some efforts have been made, notably adding lead to BSCCO, which is well known to help promote high Tc phases by chemistry alone. However, relativistic effects similar to those found in lead-acid batteries might be responsible suggesting that a similar mechanism in mercury- or thallium-based cuprates may be possible using a related metal such as tin.
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